Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b80efc6fda9424a…

MALICIOUS

PDF

74.1 KB Created: 2021-09-19 17:43:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: fdde62c61b8d38c4266bbdb8e92fc2e3 SHA-1: 12720de0c034ff6b712ee73cfea1d2ba9aba166e SHA-256: 5b80efc6fda9424a07bb4d65cb287bfa843952090672232f6c1c4ee69714afcc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

This PDF file was flagged as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, suggesting a link farm designed to distribute malicious content or phish users. The document body is unreadable, but the heuristic firings strongly indicate a malicious intent to redirect users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://synerhu.ru/uplcv?utm_term=what+is+bbk+launcher PDF link annotation
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614325ad164bb---nepufofekolupefu.pdfIn PDF document text
    • http://capitaldanceacademy.com/userfiles/files/41214945729.pdfIn PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613f0ba415f46---81226576400.pdfIn PDF document text
    • http://take114.kr/FileData/ckfinder/files/20210919_08BA7D19559BD9F6.pdfIn PDF document text
    • https://harmony.im/userfiles/file/24735165253.pdfIn PDF document text
    • http://servmed.net/userfiles/file/35696624202.pdfIn PDF document text
    • http://dierenwinkelindex.nl/images/uploads/84786751704.pdfIn PDF document text
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612eaedbe4002---25895186750.pdfIn PDF document text
    • http://mobilenmr.com/files/files/nitejixegabozubosiruxi.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/koramok.pdfIn PDF document text
    • http://vanxuantravel.com/upload/files/26495610771.pdfIn PDF document text
    • https://www.cocochan.com.pk/wp-content/plugins/super-forms/uploads/php/files/8a5b8869dc57001ccd52fd48514bbd0e/xugife.pdfIn PDF document text
    • http://lamarchesainterita.be/lamarchesainterita/imgdb/news/files/26776465754.pdfIn PDF document text
    • http://azinsaghf.com/cache/fck_files/file/gajidosaxagakijobomoxu.pdfIn PDF document text
    • https://krusomying.com/data/file/riporidimadibuge.pdfIn PDF document text
    • http://ddaengshop.com/ckupload/files/wudatajawinagopobuzabivu.pdfIn PDF document text
    • http://ucinnovation.ru/admin/ckfinder/userfiles/files/pajapenabi.pdfIn PDF document text
    • https://wroclawmodelshow.pl/ckfinder/userfiles/files/73072428435.pdfIn PDF document text
    • http://gazosilikatnn.ru/uploads/files/difijawesolo.pdfIn PDF document text
    • https://hotelite.in/userfiles/file/61399916162.pdfIn PDF document text
    • http://salukool.ee/upload/userfiles/file/vilisuzolasise.pdfIn PDF document text
    • http://eco-building.cz/UserFiles/File/42645236888.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bfde.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBFDE 10532 bytes
SHA-256: 9f9431e6b6016273d7db32adc9ede4db3b2954c89cc3ff1aa061ceeb3d993b45
font_01_sfnt_off0000d7d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7D5 16772 bytes
SHA-256: c02660bdc871229d375036e5db1878b58862ad5a4783516467adcdbac5b2c702
font_02_sfnt_off00010341.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10341 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1